Taking centre stage in < a href="http://www.selfridges.com/GB/en/cat/astley-clarke/jewellery-watches/" style="text-decoration: none"><font color="black"><b>Astley Clarke</b></font></a>&#39;s Astronomy collection, the <b>Earth necklace</b> is a true statement piece. This eye-catching design features an ocean of blue sapphires, diamond North and South poles, as well as an orbiting moon crafted from a single pearl. Set in 14-carat white gold, a pavé setting has been used to recreate Earth&#39;s curvature, while the Western continents are illustrated using green glass enamel.